Yokai Monsters is a series of Japanese tokusatsu movies created in the 1960s.

There were originally three movies made:

Yokai Monsters: Spook Warfare (1968)
Yokai Monsters: One Hundred Monsters (1968)
Yokai Monsters: Along With Ghosts (1969)
The films were produced by Daiei Motion Picture Company, and bear a resemblance to that studio’s other series, Gamera and Daimajin, and to other Japanese pop culture favorites like Godzilla and Ultraman.

Legend has it that the Yokai monsters will only interfere with human affairs when it is absolutely necessary. Things are quite awry, however, and it is time for these mythic figures to step in. A crooked magistrate and developer are booting the residents of an apartment building onto the street, and when the owner of the building tries to stop them, he is murdered. Now a masterless samurai must call upon the spiritual protectors of human kind in order to right the wrongs of his world.